Tape cartridge of two-way system

Abstract: A tape cartridge of the two-way system includes large-sized and small-sized tape cartridges each housing a memory element having a set of terminals for electric connection with corresponding terminals in a video tape player. The level at which the terminals of the memory element in the large-sized tape cartridge are installed and the level at which the terminals of the memory element in the small-sized tape cartridge are installed are defined at the same level spaced from a longitudinal mid center line of the length of magnetic tape intermediate of the width thereof or a reference plane in which a reel support lies.

Description: The present invention relates to a two-way system comprising a large-sized tape cartridge and a small-sized tape cartridge each including a reeled length of magnetic recording tape of the same width and employing the same data memory element. A tape cartridge such as, for example, a 8-mm video tape cartridge or a VHS video tape cartridge, in which a memory element for storage of such data associated with recording as recording mode, recorded voice data and/or preset parameters has been well known in the art. Such a tape cartridge is disclosed in, for example, the Japanese Laid-open Patent Publications JP-A-63-166085, published July 7, 1988, and JP-A-63-164085, published July 9, 1988. According to these patent publications, terminals of the memory element are exposed to the outside of the cartridge casing so that, when the tape cartridge is loaded in a video tape player, the terminals of the memory element can be automatically connected electrically with corresponding terminals disposed in the video tape player. These tape cartridges and the arrangement of the terminals or the memory element are only designed for one specific size of the cartridge. The problem how to arrange the memory element for different sized cartridges is not addressed. The patents US-A-4 743 984 reflecting the preamble of claim 1 and JP-A-61 094 287 disclose tape cartridges of different sizes namely in length and width having information carrier elements located between the two wheels and the front side of the cartridge. The information carrier elements are arranged such that the information carrier elements are located at the same position in a plane normal to the axis of rotation of the wheels for all sizes of cartridges. The information is read out with optical detection means sensing probes of a sensing mechanism. As a tape cartridge for use with this type of video tape player, a two-way system has been suggested which includes a small-sized tape cartridge which is designed so compact as to enable it to be used outdoors, and a large-sized tape cartridge of a stay-at-home model for long-time use at home. In the large-sized and small-sized tape cartridges of the two-way system, since the length of magnetic recording tape of the same width is employed to secure a compatibility, the both are generally set to have an equal thickness. However, in terms of the physical strength of the casing and securement of closure of reel holes, it is preferred that the large-sized tape cartridge is set to have a greater thickness than that of the small-sized tape cartridge. Then, a problem arises that, if the large-sized and small-sized tape cartridges come to have different thicknesses, the position at which the terminals of the memory element in the large-sized tape cartridge comes to be different from that in the small-sized tape cartridge and the video tape player will fail to accommodate it. In other words, in order for either one of the large-sized and small-sized tape cartridge to be accommodated by the video tape player in reference to a position intermediate of the width thereof, the video tape player will have two sets of corresponding terminals disposed at different levels corresponding to the positions of the terminals of the respective memory elements in the large-sized and small-sized tape cartridges, respectively, rendering an internal mechanism of the video tape player to be complicated. This in turn beings about an increase in cost. In view of the foregoing, the present invention is intended to provide the capability of the terminals in the video tape player being concurrently used for both of the terminals of the memory element in the large-sized tape cartridge and the terminals of the memory element in the small-sized tape cartridge and thereby to provide simplification of the mechanism of the video tape player and reduction in cost thereof. According to the invention this is achieved with a two-way tape cartridge system as claimed in claim 1. A two-way system according to the present invention is featured in that the level at which the terminals of the memory element in the large-sized tape cartridge are installed and the level at which the terminals of the memory element in the small-sized tape cartridge are installed are defined at the same level spaced from a longitudinal mid center line of the length of magnetic tape intermediate of the width thereof or a reference plane in which a reel support lies. According to the present invention, the same terminals disposed in the video tape player can be concurrently utilized for connection with either one of the terminals of the memory element in the small-sized tape cartridge and the terminals of the memory element in the large-sized tape cartridge. Therefore, the video tape player need not be provided with two sets of terminals, which would be required if the memory elements are housed within the large-sized and small-sized tape cartridges at respectively different positions. This brings about such an advantage that the mechanism of the video tape player can be rendered compact in size and inexpensive. This and other objects and features of the present invention will become clear from the following description taken in conjunction with preferred embodiments thereof with reference to the accompanying drawings, in which like parts are designated by like reference numerals and in which: Fig. 1 is a rear view, with portions cut away, showing large-sized and small-sized tape cartridges in side-by-side fashion for comparison purpose; Fig. 2 is a top plan view, with an upper casing half removed, showing the interior of the small-sized tape cartridge embodying the present invention; Fig. 3 is an exploded view of the small-sized tape cartridge; Fig. 4 is a top plan view, on an enlarged scale, of an portion of the small-sized tape cartridge showing a manner in which a memory element is accommodated; Fig. 5 is a cross-sectional view taken along the line A-A in Fig. 4; Fig. 6 is a perspective view of the small-sized tape cartridge as viewed from bottom rear; Fig. 7 is a fragmentary side sectional view of a pocket area of the small-sized tape cartridge; Fig. 8 is a view similar to Fig. 4, showing another manner in which the memory element is accommodated; and Fig. 9 is a view similar to Fig. 4, showing a modified manner in which the memory element is accommodated; Figs. 2 to 7 illustrate one of the tape cartridges of two-way system, that is, the small-sized tape cartridge C2. Referring particularly to Figs. 2 and 3, the small-sized tape cartridge C2 comprises a casing 1B made up of top and bottom casing halves 1a and 1b jointed together to define the generally rectangular box-like casing 1B. The casing 1B so formed has a tape chamber defined therein and accommodating a pair of reels 3 to which opposite ends of a length of magnetic recording tape 3 are anchored, respectively. The length of magnetic tape drawn from one of the reels 3 is wound around the other of the reels 3 after having been guided by tape guides 6 disposed in tape guide arms 5 at a front of the tape cartridge C2. At a front center portion of the casing 1B, the small-sized tape cartridge C2 has a pocket 7 defined between the tape guide arms 5 so as to open upwardly and downwardly and also frontwardly thereof. A portion of the length of magnetic recording tape 2 traversing the pocket 7 is protected by a lid assembly including generally rectangular front, rear and upper lid 9, 10 and 11. As best shown in Fig. 7, the front lid 9 is pivotally supported by left-hand and right-hand stud shafts 12 for pivotal movement about a hinge axis, defined by the stud shafts 12, between a closed position, at which respective front openings of the tape guide arms 5 and a front portion of the pocket 7 are closed as shown by the solid line, and an open position as shown by the phantom line. This front lid 9 is normally biased towards the closed position by a biasing spring 13, shown in Fig. 2, mounted on one of the stud shafts 12. The upper lid 11 is operatively associated with the front lid 9 and is pivotable between a closed position, at which an upper portion of the pocket 7 is closed as shown by the solid line in Fig. 7, and an open position at which the lid 11 has been shifted upwardly and rearwardly of the pocket 7 as shown by the phantom line in Fig. 7. For this purpose, the upper lid 11 has its opposite ends formed with respective arms 14 having connecting pins 15 at front ends thereof, said connecting pins 15 being rotatably engaged in associated bearing holes 16 which are formed on left-hand and right-hand portion of an upper edge of the front lid 9. The arms 14 integral with the upper lid 11 also have slide pins 17 at rear ends thereof, said slide pins 17 being slidably engaged in cammed guide grooves 19 which are defined in left-hand and right-hand side walls of the casing 1B. Referring particularly to Figs. 3 and 7, the rear lid 10 has its opposite ends formed with connecting pins 20 extending from an upper edge thereof in a direction away from each other and is pivotally mounted on the upper lid 11 with the connecting pins 20 rotatably engaged in pin holes 21a which are defined in respective bosses 21 formed on an inner surface of the upper lid 11. This rear lid 10 also has left-hand and right-hand legs 22 formed integrally with a lower rear surface thereof, and slide pins 23 formed integrally with the respective legs 22 so as to protrude laterally outwardly therefrom, said slide pins 23 being slidably engaged in generally S-shaped guide grooves 24 defined in left-hand and right-hand side walls of the casing 1B defining the pocket 7. Accordingly, this rear lid 10 is operatively associated with the front lid 9 and the upper lid 11 so as to pivotally move between a back-up position, at which the rear lid 10 occupies a position immediately rearwardly of that portion of the length of magnetic tape 2 traversing the pocket 7 as shown by the solid line in Fig. 7, and a clear position at which, as shown by the phantom line in Fig. 7, the rear lid 10 occupies a position upwardly and rearwardly of the pocket 7 and generally below the upper lid 11 then held at the opened position. As shown in Figs. 4 and 5, the casing 1B has a memory element 25 housed therein. This memory element 25 is a unitary structure of a generally cubic configuration including a read-only memory (ROM) storing fixed data such as, for example, the specification of and/or characteristic data descriptive of the magnetic tape 2 used, a random access memory for storage of variable data such as, for example, data presettable during recording and a battery all incorporated therein. As shown in Figs. 3 and 4, the memory element 25 has a set of terminals 26 which are exposed to the outside in part from a rear face 25a and in part from a bottom face 25b, said set of terminals 26 being adapted to be electrically connected with a corresponding number of terminals (not shown) installed in a video tape player (also not shown). The memory element 25 is mounted in the casing 1B with the set of terminals 26 exposed to the outside of the casing 1B through two adjoining wall segments of the casing 1B. In the illustrated embodiment, the memory element 25 having the set of terminals 26 is mounted in the casing 1B so that the set of the terminals 26 are exposed to the outside of the casing 1B in part through a rear wall segment 27 and a bottom wall segment 28 lying perpendicular to the rear wall segment 27. For this purpose, a portion of the rear wall segment 27 of the casing 1B intermediate of the width of the casing 1B and a portion of the bottom wall segment 28 adjacent the rear wall segment 27 and intermediate of the width of the casing 1B are formed with respective openings 29 which are continued with each other so that, when the memory element 25 is mounted in position within the casing 1B, the rear and bottom faces 25a and 26b are exposed to the outside of the casing 1B through the openings 29. Although the openings 29 may be separate from each other, that the openings 29 are continued or communicated with each other such as shown in Figs. 3 and 6 is particularly advantageous in that, during a plastic molding to form the bottom casing half 1b, no undercut is necessarily formed and, therefore, a mold separation can be facilitated. Those portion of the rear and bottom wall segments 27 and 28 where the respective openings 29 are located in alignment with a generally triangular blind spot delimited by the rear wall segment 27 and the rolls of magnetic tape 2 around the respective reels 3 and, therefore, no extra space for installation of the memory element 25 is required. In other words, the present invention makes a maximized utilization of such blind spot to accommodate the memory element 25. The memory element 25 so positioned as hereinbefore described has opposite end faces and a front face 25c, opposite to the rear face 25a, all surrounded by a surrounding rib 30 formed integrally with the bottom wall segment 28, said surrounding rib 30 being so configured as to separate a memory chamber from a tape chamber within the casing 1B. As best shown in Figs. 4 and 5, in order to ensure a firm electric connection between the terminals 26 of the memory element 25 and the corresponding terminals in the video tape player, elastic elements 31 such as, for example, compression springs, are interposed between the front face 25c of the memory element 25 and the surrounding rib 30 and a top face 25d of the memory element 25 and a top wall segment of the casing 1B (i.e., a top panel of the upper casing half 1a), respectively. Thus, it will readily be understood that the memory element 25 is normally biased rearwardly and downwardly of the casing 1B with the set of the terminals 26 situated within the openings 29. With the memory element 25 so urged by the elastic members 31 as described above, the casing 1B is provided with means for regulating the stroke of rearward and downward movement of the memory element 25. This can be accomplished by choosing the width of each of the openings 29, as measured in a direction parallel to a reel-to-reel direction, to be smaller than the width of each of the rear and bottom faces 25a and 25b of the memory element 25 as measured in a corresponding direction so that the rear and bottom faces 25a and 25b of the memory element 25 will not protrude outwardly protrude through the respective openings 29 with their peripheral regions held in abutment with inner peripheral surface areas of the rear and bottom wall segments 27 and 28. It is to be noted that, for the elastic members 31, torsional springs or leaf springs may be employed in place of the compression springs that are employed in the illustrated embodiment. The use of the leaf springs for the elastic members 31 is illustrated in Fig. 8. It is also to be noted that the elastic members 31 may not be always limited to springs made of metal or non-metal and separate from the casing 1B, but may be spring made of plastics and formed integrally with the casing 1B as shown in Fig. 9. As hereinbefore described, the set of the terminals 26 of the memory element 1B accommodated within the casing 1B are exposed to the outside of the casing 1B in part through the opening 29 in the rear wall segment 27 and in part through the opening 29 in the bottom wall segment 28 and, therefore, regardless of whether the corresponding terminals in the video tape player are disposed so as to confront the rear face 25a of the memory element 25 or whether they are disposed so as to confront the bottom face 25b thereof, the set of the terminals 26 of the memory element 25 can be assuredly and firmly connected electrically with the set of the corresponding terminals in the video tape player once the tape cartridge embodying the present invention is loaded in the video tape player. This is possible because, once the electric connection is established between the set of the terminals 26 of the memory element 25 and the corresponding terminals in the video tape player, the elastic members 31 accumulate respective biasing forces with which the contact pressure between the terminals 26 of the memory element 25 and the corresponding terminals in the video tape player is increased. Also, the elastic members 31 used to bias the memory element 25 have an additional function of absorbing shocks imposed on the memory element 25 either directly or indirectly. More specifically, in the event that the tape cartridge is inadvertently dropped onto a ground and an external shocks is consequently applied to the memory element either directly or through the casing 1B, the memory element may displace in position. However, such possible displacement of the memory element 25 is accommodated by one or both of the elastic members 31 to cushion the memory element, thereby minimizing the possibility of some of the terminals 26, or the memory element 25 itself, being damaged. While the foregoing description is made in connection with the small-sized tape cartridge C2, the large-sized tape cartridge C1 is shown in Fig. 1 in comparison with the small-sized tape cartridge, having a basic structure substantially identical with that of the small-sized tape cartridge. In other words, the large-sized tape cartridge C1 comprises, as is the case with the small-sized tape cartridge, a casing 1A made up of top and bottom casing halves jointed together to define the generally rectangular box-like casing 1A. The casing 1B so formed has a tape chamber defined therein and accommodating a pair of reels 3 to which opposite ends of a length of magnetic recording tape 2 are anchored, respectively. Also, similarly, the casing 1A includes front, rear and upper lids 9, 10 and 11 all operatively associated with each other and, again, includes a memory element 25 of the same size housed therein at the same position in the same manner as that employed in the small-sized tape cassette. However, the large-sized tape cartridge C1 differs from the small-sized tape cartridge C2 in that the casing 1A of the large-sized tape cartridge C1 has a heightwise dimension or thickness H1 greater than the heightwise dimension or thickness H2 of the casing C2 of the small-sized tape cartridge C2. This is because the casing C1 accommodates a greater length of magnetic recording tape 2 than that in the casing C2 of the small-sized tape cartridge and does therefore require a correspondingly increased rigidity. To secure a compatibility with the small-sized tape cartridge C2, the length of magnetic recording tape 2 having the same width as that of the magnetic recording tape 2 accommodated in the small-sized tape cassette C2 is wound around the reels 3 in the casing C1. In Fig. 1, reference character X represents the heightwise position or level at which a longitudinal mid-center line of the magnetic tape 2 intermediate of the width thereof lies during the travel of the length of magnetic recording tape 2 from one reel 3 to the other reel 3, and this position X remains the same in both of the large-sized and small-sized tape cartridges C1 and C2. The heightwise position of the set of the terminals 26 of the memory element 25 employed in the large-sized tape cartridge C1 is chosen to be at a position spaced a distance a from the heightwise position or level X at which the longitudinal mid-center line of the magnetic tape 2 lies. In other words, the heightwise position of the set of the terminals 26 of the memory element 25 employed in the large-sized tape cartridge C1 is chosen to be the same as that of the set of the terminals 26 of the memory element 25 employed in the small-sized tape cartridge C2. For this purpose, and considering that the memory element 25 of the same size is employed in both of the large-sized and small-sized tape cartridges C1 and C2, the casing 1A of the large-sized tape cartridge C1 has a heightening rib 32 formed on an inner surface of the bottom wall segment thereof, and the memory element 25 is mounted on this heightening rib 32 thereby to render the heightwise position of the set of the terminals 26 of the memory element 25 in the large-sized tape cartridge C1 to be the same as that of the set of the terminals 26 of the memory element 25 in the small-sized tape cartridge C2. Thus, when both of the heightwise position of the set of the terminals 26 of the memory element 25 employed in the large-sized tape cartridge C1 and the heightwise position of the set of the terminals 26 of the memory element 25 employed in the small-sized tape cartridge C2 are so chosen as to be spaced the distance a from the heightwise position or level X at which the longitudinal mid-center line of the magnetic tape 2 lies, the set of the corresponding terminals in the video tape player which are disposed at the same heightwise position can be concurrently used for both of the set of the terminals 26 of the memory element 25 employed in the small-sized tape cartridge C2 and the set of the terminals 26 of the memory element 25 employed in the large-sized tape cartridge C1. In the illustrated embodiment, in determining the position of the memory element 25 employed in both of the large-sized and small-sized tape cartridges C1 and C2, reference has been made to the heightwise position or level X at which the longitudinal mid-center line of the magnetic tape 2 lies. However, reference may be made to a reel support Z employed in the video tape player as will now be described with reference to Fig. 1. When either one of the large-sized and small-sized tape cartridges C1 and C2 is set in position loaded within the video tape player, one of the reels 3 which is exposed to the outside through a reel hole 33 defined in the bottom wall segment of the corresponding tape cartridge C1 or C2 has a lower end face supported on the reel support Z as shown. The heightwise dimension b from the reel support Z in the video tape player remains the same for each of the large-sized and small-sized tape cartridges C1 and C2. Speaking differently, the level in which the reel support Z lies is spaced an equal distance b from the heightwise position or level X regardless of the size of the tape cartridges C1 and C2. Accordingly, even where the heightwise position of the set of the terminals 26 of the memory element 25 in the large-sized tape cartridge C1 and those in the small-sized tape cartridge C2 are chosen in reference to the reel support Z in the video tape player so as to be spaced the heightwise dimension or distance b, the set of the corresponding terminals in the video tape player which are disposed at the same heightwise position can be concurrently used for both of the set of the terminals 26 of the memory element 25 employed in the small-sized tape cartridge C2 and the set of the terminals 26 of the memory element 25 employed in the large-sized tape cartridge C1. Although the present invention has been described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. By way of example, in each of the large-sized and small-sized tape cartridges C1 and C2, the position where the memory element 25 is housed may be an intermediate portion of a partition wall 34 partitioning the pocket 7 from the tape chamber, which is intermediate of the width thereof. Also, the surrounding rib 30 and the rear wall segment 27 defining the cavity for housing the memory element 25 such as shown in Figs. 4, 8 and 9 may be in the form of a holder separate from the corresponding casing 1A or 1B and, in such case, molding material for the formation of the holder may be plastics or rubber added with chemical destaticizer (antistatic additive) such as non-ionic, anionic or cationic surfactant, and electroconductive filler such as carbon black or metallic particles. The holder may have its surface coated with an electroconductive paint, electroplated, sprayed with metal, plated with metal foil or treated in any suitable manner. In this way, since the holder is capable of dissipating electrostatic charge, the memory element 25 can be protected from electrostatic charge.

Claims: A two-way system including a large-sized tape cartridge (C1) and a small-sized tape cartridge (C2), each tape cartridge (C1,C2) comprising a substantially rectangular box-like casing (1A;1B) including a pair of reels (3,3) housed therein, a length of magnetic tape (2) having opposite ends anchored to the respective reels (3,3) and an information carrier element housed therein, said casing (1A;1B) also including a front wall, a rear wall opposite to the front wall and opposite side walls lying perpendicular to any one of the front and rear walls, wherein the heightwise dimensions of the casings (lA;lB) being different from each other while the lengths of magnetic tape (2) have respective widths equal to each other, and each information carrier element comprising a memory element (25) having a set of terminals (26), said memory element (25) being accommodated within the casing (1A;1B) with the set of terminals (26) exposed to the outside of the casing (1A;1B), characterized in that border lines of said memory element (25) are located at a heightwise location spaced a predetermined distance from the level at which a longitudinal mid-center line (X) of the length of magnetic tape (2) which runs between the reels (3,3) lies or from the level (Y) at which a surface of a reel support (Z) which supports any one of the reels (3) from below lies, so that the position of the memory element (25) is defined in a heightwise position, wherein said predetermined distances of the memory elements (25) are equal to each other. The two-way system as claimed in claim 1, wherein the casing (1A;1B) has an opening (29) defined therein through which the set of terminals (26) of the memory element (25) are exposed to the outside, said opening (29) having a width, as measured in a direction widthwise of the cartridge (1A;1B) which is smaller than the width of the memory element (25). The two-way system as claimed in one of claims 1 or 2, wherein the set of terminals (26) of the memory element (25) in the casing (1A;1B) are exposed to the outside of the casing (1A;1B) in part through one of adjoining wall faces of the casing (1A;1B) and in part through the other of adjoining wall faces of the casing (1A;1B). The two-way system as claimed in one of claims 1-3, further comprising elastic means (30;31) housed within the casing (1A;1B) for biasing the memory element (25) towards an opening (29) defined in the casing (1A;1B).

Inventors: MAEHARA YOSHIMI, MASUDA KENMEI, MIZUTANI HIKARU, NISHIJIMA TATSUMI, TAKEDA HIDEKAZU, MAEHARA, YOSHIMI, MASUDA, KENMEI, MIZUTANI, HIKARU, NISHIJIMA, TATSUMI, TAKEDA, HIDEKAZU, MASUDA, KENMEI, E-205 GREEN PARK, NISHIJIMA, TATSUMI, HITACHI SESHIRIA NAGATA-DAIRYO
Applicants: HITACHI LTD, HITACHI MAXELL, HITACHI MAXELL LTD., HITACHI, LTD.
Application year: 1994
Main classification: G11B25
IPC codes: G11B23, G11B15, G11B25